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<title>Berkeley DB Reference Guide: Release 3.1: upgrade requirements</title>
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<td><b><dl><dt>Berkeley DB Reference Guide:<dd>Upgrading Berkeley DB Applications</dl></b></td>
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<p align=center><b>Release 3.1: upgrade requirements</b></p>
<p>Log file formats and the Btree, Queue, Recno and Hash Access Method
database formats changed in the Berkeley DB 3.1 release.  (The on-disk
Btree/Recno format changed from version 7 to version 8.  The on-disk
Hash format changed from version 6 to version 7.  The on-disk Queue
format changed from version 1 to version 2.)  Until the underlying
databases are upgraded, the <a href="../../api_c/db_open.html">DB-&gt;open</a> method will return a
<a href="../../api_c/db_open.html#DB_OLD_VERSION">DB_OLD_VERSION</a> error.</p>
<p>An additional flag, <a href="../../api_c/db_set_flags.html#DB_DUPSORT">DB_DUPSORT</a>, has been added to the
<a href="../../api_c/db_upgrade.html">DB-&gt;upgrade</a> method for this upgrade.   Please review the
<a href="../../api_c/db_upgrade.html">DB-&gt;upgrade</a> documentation for further information.</p>
<p>For further information on upgrading Berkeley DB installations, see
<a href="../../ref/upgrade/process.html">Upgrading Berkeley DB
installations</a>.</p>
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